$\left(x+1\right)\left(x+2\right)\left(x+3\right)+\left(x+2\right)\left(x+3\right)\left(x+4\right)\left(x+5\right)$
$\frac{x^n}{6^nx^3}$
$\left(2x+x^2\right)^4-\left(2x-x^2\right)^2$
$x^7+128$
$\frac{d}{dx},\:xy^2+e^{xy}=x^3+y$
$p+q^2=14$
$x^3-3x^3$
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